Lexus ES300 (2002 year). Manual — part 310
F41990
Skid Control ECU
Driver Side J/B
3
S7
STP
Passenger Side j/B
S13
Stop Light SW
2G
7
4
2M
ST+
51
61
2
3A
3A
A
G-W
G-W
SB
R14
Rear Combination
Light RH
R12
Rear Combination
Light LH
STOP
BC
BE
J12
J/C
STOP
3
1
3
1
G-W
G-W
G-W
G-W
W-B
W-B
STOP
2G
13
15
2K
2E
1
W
From Battery
L4
Light Failure Sensor
G-W
7
2
ST-
1
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-359
512
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1249/49 OPEN CIRCUIT IN STOP LIGHT SWITCH
CIRCUIT
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1249/49
ECU terminal IG1 voltage is 9.5 to 18.5 V and ABS is in
non-operation, the open in circuit stop light switch circuit
continues for 10 sec. or more.
Stop light bulb
Stop light switch circuit
WIRING DIAGRAM
0529S-03
F40456
STP
05-360
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
513
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
CHECK STOP LAMP SWITCH OPERATION
CHECK:
Check that the stop light lights up when brake pedal is depressed and turns off when the brake pedal is re-
leased.
OK
Go to step 3
NG
2
CHECK STOP LAMP SWITCH CIRCUIT
NG
REPAIR OR REPLACE STOP LAMP SWITCH
CIRCUIT
OK
3
CHECK SKID CONTROL ECU TERMINAL VOLTAGE(STP TERMINAL)
(a)
Remove the skid control ECU with connectors still con-
nected.
(b)
Measure voltage between terminal STP of skid control
ECU and body ground when brake pedal is depressed.
OK: 8 - 14 V
(c)
Measure voltage between terminal STP of skid control
ECU and body ground when brake pedal is released.
OK: Below 1.5 V
OK
CHECK AND REPLACE SKID CONTROL ECU
ASSY
NG
4
CHECK HARNESS AND CONNECTOR(STOP LAMP SWITCH - SKID CONTROL
ECU ASSY)(See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE
(See page
F41979
Battery
FL MAIN
Skid Control ECU
ALT
EB
ABS R/B
W-R
24
MRF
Engine Room R/B
S8
S5
1
23
14
R+
MR
MT
ABS & Traction Actuator
ABS MTR Relay
A5
A5
A5
A5
1
4
3
2
2
2
2
2
2
1
3
5
1G
1A
1
1
1
2
5
ABS
No. 2
Engine Room J/B
GR-L
W-L
GR-L
GR-R
+BM
MR
MT
GND
W-B
W-B
R-W
B-G
1
2
1
S8
S8
B-G
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-361
514
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1251/51 PUMP MOTOR IS LOCKED/OPEN CIRCUIT
IN PUMP MOTOR GROUND
CIRCUIT DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
C1251/51
Conditions 1., 2. and 3. continue for 0.024 sec.:
1. While checking self diagnosis of ECU, after current
flows to motor for 0.3 sec. within 0.054 sec. from turning
OFF motor relay.
2. While checking self diagnosis of ECU, after current
flows to motor for 1.4 sec. within 0.054 sec. from turning
OFF motor relay
3. Motor relay contact turned OFF
ABS pump motor
WIRING DIAGRAM
055W8-02
05-362
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
515
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using hand-held tester.
1
PERFORM ACTIVE TEST BY HAND-HELD TESTER(ABS PUMP MOTOR
OPERATION)
(a)
Select the item ”ABS MOT RELAY” in the ACTIVE TEST and operate the ABS motor relay on the hand-
held tester.
(b)
Check the operation sound of the ABS pump motor when operating it with the hand-held tester.
OK:
The operation sound of the pump motor should be heard.
NG
REPLACE ABS & TRACTION ACTUATOR ASSY
OK
2
RECONFIRM DTC(See page
)
A
Normal Code
B
Malfunction Code
B
CHECK AND REPLACE SKID CONTROL ECU
ASSY
A
END
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